Tachometer Is Inaccurate
Connect a test tachometer to the ignition system. Start engine. Compare vehicle tachometer reading to test tachometer reading. If vehicle tachometer reading is outside allowable range, replace tachometer. See TACHOMETER TEST table.
TACHOMETER TEST
| Vehicle Tachometer RPM | Allowable Test Tachometer RPM |
|---|---|
| 700 | 610-750 |
| 1000 | 900-1000 |
| 2000 | 1850-2150 |
| 3000 | 2800-3200 |
| 4000 | 3800-4200 |
| 5000 | 4800-5200 |
| 6000 | 5750-6250 |
| 7000 | 6700-7300 |